JP2649899B2 - Cushion material for forming press - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cushioning material for forming presses used for press-forming laminated boards such as decorative plywood, printed circuit boards and electric insulating boards.

[0002]

2. Description of the Related Art Referring to FIG. 9, when a laminate is manufactured by forming a sheet by hot pressing, generally,
The object 3 to be molded is sandwiched between the hot platen 1 and the hot platen 2 to apply a constant pressure and heat. During this press molding,
As shown in the drawing, metal mirror plates 4 and 5 are arranged at positions that directly contact the object 3. Further, in order to apply uniform pressure and heat to the entire surface of the object to be processed, a flat cushion member 6 is disposed between the hot platen 1 and the mirror plate 4, and the hot plate 2 and the mirror plate 5 are arranged.
And a flat cushion member 7 is disposed between them.

The main purpose of interposing the cushion members 6 and 7 is to apply a uniform pressure and a uniform heat to the entire surface of the processing target 3 to obtain a laminate having excellent thickness accuracy and surface smoothness. is there. Therefore, the cushion materials 6, 7
The properties required for include, for example, cushioning property, thermal conductivity, heat resistance, durability, dimensional stability, and surface releasability.

[0004] As a cushioning material for a molding press which has been used for a long time, there is a material in which about 5 to 20 kraft papers are overlapped. This cushion material made of kraft paper has a low unit price and has excellent cushioning properties at the beginning of use. However, the durability in repeated use is extremely poor, and the use from one time to at most five times is an allowable limit. Due to these drawbacks, cushion materials made of kraft paper have hardly been used in recent years.

On the other hand, various types of cushioning materials have been provided as cushioning materials having improved durability.

[0006] First, as shown in FIG.
There is one in which a reinforcing woven fabric 9 is embedded. This cushioning material is superior in durability in repeated use to kraft paper. However, since there is no void portion in the rubber, when it is subjected to a compressive force, the open side portion swells to generate elongation and permanent deformation. This dimensional change adversely affects the quality of the laminate to be processed. Therefore, the reinforcing woven fabric 9 is buried in order to suppress such a dimensional change. However, if the reinforcing woven fabric 9 is buried, the rubber elasticity is lost, and as a result, the rubber sheet such as cushioning property and pressure equalizing action is obtained. You lose eight advantages. Further, since there is no void portion, the thermal conductivity is too good, and the temperature variation of the hot plate is transmitted as it is, so that the thermal conductivity tends to be uneven.

[0007] FIG. 11 shows a reinforcing base cloth 11 in a nonwoven fabric layer 10.
FIG. 2 shows a cushion material on which needle punching has been performed in a state in which a rubber sheet is interposed. The reinforcing base cloth 11 has one or two or more layers embedded therein. With this cushioning material, since the nonwoven fabric layer 10 includes voids, the cushioning property is good and the heat insulating effect is large. It does not swell in the lateral direction like a rubber against a compressive force. In other words, the shape stability against compression is good.

The cushioning material made of the needle-punched nonwoven fabric as shown in FIG. 11 has the above-mentioned advantages, but has the following disadvantages. The nonwoven fabric essentially includes surface irregularities and uneven weight. Such unevenness of the surface and unevenness of the surface cause unevenness of heat conduction and unevenness of pressure. In addition, by applying the needle punch, unevenness in the weight is further increased. In addition, since the proportion of voids in the nonwoven fabric decreases with long-term use, the thermal conductivity and cushioning properties change over time. FIG.
In the case of the rubber layer 8 shown as 0, there is no void portion, and thus such a temporal change is small.

The cushion material shown in FIG. 12 has a nonwoven fabric layer 1 which is needle-punched as shown in FIG. 11 on the upper and lower surfaces of a rubber layer 13 with a reinforcing woven fabric 12 interposed therebetween.
4 and 15. This cushion material has both good cushioning properties of the nonwoven fabric layers 14 and 15 and stability over time of the rubber layer 13. However, since the nonwoven fabric layers 14 and 15 are present on the outermost surface side, the defects of the nonwoven fabric layer, that is, surface irregularities and uneven weight appear as the cushioning material.

In the cushioning material shown in FIG. 13, needle-punched nonwoven fabric layers 16 and 17 are laminated via an adhesive 18 in which glass cloth is impregnated with epoxy resin. By forming the non-woven fabric layer in this way,
The non-uniformity in the weight of each non-woven fabric layer can be offset to some extent, but since the non-woven fabric layers 16 and 17 are present on the outermost surface side, the above-mentioned disadvantages of the non-woven fabric layer cannot be fundamentally eliminated. In addition, since the adhesive is hard, it cannot follow the shape change of the nonwoven fabric layers 16 and 17 at the time of receiving a pressing force at all, and there is also a problem that the adhesive is peeled off due to breakage of the glass cloth when used for a long time. Occur.

The cushioning material 19 shown in FIG. 14 is obtained by mixing and forming an aromatic polyamide fiber and rock wool. This cushioning material has the advantages of good heat resistance, little dimensional change in material and little unevenness in weight. However, there are disadvantages such as poor cushioning property, fine irregularities due to the fiber material on the surface, and easy delamination between layers.

FIG. 15 shows a cushioning material for a forming press disclosed in Japanese Patent Publication No. 47-46945. This cushion material has rubber layers 21 and 22 on the upper surface and the lower surface of the nonwoven fabric layer 20 that has been needle-punched. Silicone rubber, nitrile rubber,
Butyl rubber and the like are described. FIG. 16 is an enlarged cross-sectional view of FIG.

The cushioning material shown in FIG. 15 has both good cushioning properties of the needle-punched nonwoven fabric and uniformity of the pressing force due to the rubber elasticity of the surface rubber layer. Also, unlike the cushioning material shown in FIGS. 11 to 13, this cushioning material has the rubber layers 21 and 22 disposed on the upper and lower surfaces of the needlepunched nonwoven fabric layer 20, so that the unevenness of the surface of the needlepunched nonwoven fabric layer is obtained. The rubber layers 21 and 22 can offset the adverse effects caused by unevenness and unevenness in weight. This is because when the rubber layers 21 and 22 and the nonwoven fabric layer 20 are vulcanized and bonded in the process of manufacturing the cushioning material, as shown in FIG.
This is because the fluidized rubber at the interface with the non-woven fabric 22 enters the fiber unevenness on the surface of the nonwoven fabric layer and can absorb unevenness in weight and unevenness on the surface.

[0014]

However, the cushioning material for a molding press disclosed in Japanese Patent Publication No. 47-46945 has the following disadvantages.

First, the needle-punched nonwoven fabric layer 20
Since no reinforcing material is interposed therebetween, the needle-punched nonwoven fabric layer 20 has a rubber layer 21 when the cushion material is used.
It moves following the shape change of 22, causing pressure unevenness.

Second, it is still not enough to eliminate the influence of the non-uniform weight of the nonwoven fabric layer by the rubber layers 21 and 22 on the surface.

The third problem is an adverse effect due to exudation of the compounding agent contained in the rubber layers 21 and 22. While using the cushioning material under heat and pressure, the rubber layer 21,
The low molecular weight compounding agent exudes on the surface of No. 22. If this exudation is left unchecked, not only will the appearance of the cushioning material for the forming press be poor, but also the mirror plate or the laminate to be processed will be contaminated, or the mirror plate or the hot plate will adhere to the cushion material. In order to prevent the exudation of the compounding agent, it is conceivable to adhere an exudation prevention layer such as a film or a metal foil to the surfaces of the rubber layers 21 and 22. In reality, however, the influence of the cured adhesive is considered. Pressure distribution was not uniform, resulting in uneven pressure, and poor heat resistance of the adhesive caused uneven heat conductivity and peeling, which did not work well.

An object of the present invention is to provide a cushioning material for a molding press capable of transmitting a uniform pressure over the entire surface over a long period of time.

Another object of the present invention is to provide a cushioning material for a molding press capable of exhibiting uniform thermal conductivity over the entire surface.

Still another object of the present invention is to provide a cushioning material for molding press having excellent dimensional stability.

Still another object of the present invention is to provide a molding press cushion material which does not contaminate a mirror plate or a laminated plate to be processed and does not adhere to a mirror plate or a hot plate.

[0022]

According to the present invention, there is provided a cushioning material for molding press according to the present invention, in which two or more fiber material layers and upper and lower fiber material layers are located between the respective fiber material layers. Binder layer, an upper rubber layer located on the upper surface of the uppermost fiber material layer, a lower rubber layer located on the lower surface of the lowermost fiber material layer, and an upper rubber layer located on the upper surface of the upper rubber layer. An upper exudation prevention layer for preventing exudation of the compounding agent contained in the rubber layer, and located on the lower surface of the lower rubber layer,
And a lower exudation prevention layer for preventing exudation of the compounding agent contained in the lower rubber layer.

The fibrous material layer is preferably a porous material having voids therein. Since such a porous fiber material layer has voids inside, it exhibits good cushioning properties. As such a fiber material layer, for example,
Non-woven, woven or paper is employed.

Since the rubber layer is disposed on the upper surface of the uppermost fiber material layer and the lower surface of the lowermost fiber material layer, the rubber layer and the fiber material layer are laminated in the process of manufacturing the cushioning material. At the time of vulcanization bonding, the fluidized rubber at the interface between the fiber material layer and the rubber layer enters the fiber unevenness on the surface of the fiber material layer. As a result, the rubber layer absorbs unevenness in the weight of the fiber material layer and unevenness on the surface. Therefore, it is possible to prevent adverse effects due to fiber unevenness, and to obtain a uniform pressure distribution and a uniform thermal conductivity.

Further, since the exudation preventing layer is provided on the surface of the rubber layer, the low molecular weight compounding agent contained in the rubber does not exude. In this way, contamination can be prevented and the releasability can be improved. The exudation prevention layer is preferably made of a film-like material having both air permeability and mold release properties. Specific examples of such a material include a synthetic resin film and a metal foil. Woven fabrics and papers have breathability, but if they are subjected to non-breathable treatment by coating with synthetic resin liquid, laminating synthetic resin film, heat treating the surface, etc. Will be available as

All the fiber material layers may be made of the same material, or may be made of different materials. If all the fiber material layers are made of the same material, the thermal expansion coefficients of all the fiber material layers become equal, so that the cushion material does not warp and uniform pressure distribution and uniform heat conductivity can be easily obtained. Also, it is easy to manufacture.

On the other hand, if each fiber material layer is formed of a different material, the characteristics of each material can be added, and the disadvantages of each material can be compensated. However, since different materials of the fiber material layer have different coefficients of thermal expansion, it is desirable to make the combination of materials vertically symmetric from the viewpoint of preventing the cushion material from warping.

In one embodiment, the binder layer has an adhesive. As the adhesive, a heat-resistant rubber-based or synthetic resin-based adhesive can be used, and a liquid-type or sheet-type adhesive can be used. Preferred examples include fluoro rubber, silicone rubber, hydrogenated nitrile rubber, EPM, EPDM, acrylic rubber, and NB.
Adhesives such as R-based, epoxy resin-based, and polyimide resin-based adhesives may be used.

According to the present invention, since two or more fiber material layers are laminated in multiple layers with the binder material layer interposed therebetween, it is possible to cancel out the non-uniform weight of each fiber material layer, and as a result, the weight accuracy of the entire cushion material Can be improved. As a result, a uniform pressure distribution and a uniform thermal conductivity are obtained.
In addition, the weight per unit area increases as the number of laminated fiber material layers increases.

In one embodiment, the binder layer has a sheet-like base material having a small amount of deformation in the surface direction with respect to heat and pressure, and an adhesive applied to both surfaces of the base material. . As the base material, a woven fabric, a synthetic resin film, a metal foil, an inorganic fiber paper, or the like is used. As the adhesive, a rubber-based or synthetic resin-based adhesive having heat resistance is used. Specifically, fluorine rubber, silicone rubber, hydrogenated nitrile rubber,
Adhesives such as EPM-based, EPDM-based, acrylic rubber-based, NBR-based, epoxy resin-based, and polyimide resin-based adhesives can be used, and fluorine rubber-based or polyimide resin-based adhesives are particularly preferable.

Also in the above embodiment, since two or more fiber material layers are laminated in multiple layers with the binder material layer interposed therebetween, it is possible to cancel out the non-uniform weight of individual fiber material layers, and as a result, the weight accuracy of the cushion material as a whole. Can be improved. As a result, a uniform pressure distribution and a uniform thermal conductivity are obtained. While repeatedly using the cushioning material and repeating the heating and pressurization, the rubber layer tries to deform so as to expand in the surface direction, but a bonding material layer that suppresses the movement of the fiber material layer in the surface direction is formed in the fiber material. By arranging, it is possible to prevent the fiber material layer from moving following the elongation of the rubber layer. Therefore, the dimensional change is suppressed even after long-term use, and the uniformity of the pressure distribution is maintained.

[0032] In one embodiment, the binder layer is a rubber sheet. In this case, a rubber sheet in which a reinforcing woven fabric is embedded may be used.

In one embodiment, the fibrous material layer is a non-woven fabric, and the binder material layer is a base fabric. The non-woven fabric and the base fabric are bonded by the entanglement of the fibers formed by the needle punch and the base fabric. ing. As the cushioning material is used repeatedly, the rubber layer tries to deform so as to expand in the plane direction while heating and pressing are repeated, but the fiber material layer is reinforced by the base cloth, so it follows the expansion of the rubber layer As a result, it is possible to prevent the fiber material layer from moving. Therefore, the dimensional change is suppressed even after long-term use, and the uniformity of the pressure distribution is maintained.

In the above embodiment, an adhesive may be applied to the base cloth, and the nonwoven fabric and the base cloth may be joined by entanglement of the fiber formed by needle punching with the base cloth and adhesion by the adhesive. In this way, the connection is further strengthened, and the dimensional stability is further improved.

In one embodiment, the fibrous material layer is a non-woven fabric and the first binder layer is a base fabric. The non-woven fabric and the base fabric are connected by entanglement of the fiber formed by the needle punch and the base fabric. The second binder layer has an adhesive. The laminated portion of the fibrous material layer and the binder layer is a laminate in which two or more nonwoven fabric layers are joined by a first binder layer in a multistage manner via a second binder layer.
According to this embodiment, since the bonded nonwoven fabric layer is reinforced by the base fabric, the dimensional stability is good. In addition, since the bonded non-woven fabric layers are stacked in multiple stages via the second bonding material layer, uneven weight per unit area of the bonded non-woven fabric layers can be offset, the weight per unit area of the cushion material can be improved, and uniform pressure distribution and uniform heat conductivity can be achieved. Is obtained. Note that the larger the number of layers, the better the weight per unit area. As the adhesive, a rubber-based or synthetic resin-based adhesive having heat resistance can be used as in the above-described embodiment.

In the above embodiment, the second binder layer has, for example, a sheet-like base material having a small amount of deformation in the surface direction with respect to heat and pressure, and an adhesive applied to both surfaces of the base material. doing. This further improves the dimensional stability of the entire cushioning material.

In the above embodiment, for example, an adhesive is applied to the base fabric of the first binder layer. The non-woven fabric and the base cloth are bonded by the entanglement of the fiber formed by the needle punch and the base cloth and adhesion by an adhesive. By doing so, the dimensional stability of the bonded nonwoven fabric layer is further improved, and the dimensional stability of the entire cushioning material is further improved.

When the binder layer has an adhesive, a fluororubber-based adhesive is preferably used. Fluororubber-based adhesives have excellent heat resistance. Further, since it is a rubber-based adhesive, it has excellent flexibility even after vulcanization bonding, and does not impair the cushioning property of the fiber material layer.

The fiber material layer preferably has a glass transition temperature of 200 ° C. or higher and a 10% thermal decomposition temperature of 40%.
0 ° C. or higher. Heat-resistant organic fibers and inorganic fibers are used as such a fiber material layer. Examples of the heat-resistant organic fibers include aromatic polyamide fibers, polyimide fibers, and aromatic polyester fibers. Examples of the inorganic fibers include glass fibers, rock wool, and metal fibers. These heat-resistant fibers are used alone or in combination of two or more, and used as a nonwoven fabric, woven fabric or papermaking.

In a preferred embodiment, an acrylic monomer is blended in the composition for forming the upper and lower rubber layers. By blending the acrylic monomer, the rubber layer and the anti-exudation layer can be directly bonded without interposing the adhesive layer, and the manufacturing process can be simplified.

In a preferred embodiment, the upper rubber layer and the upper exudation preventing layer are adhered without interposing an adhesive layer, and the lower rubber layer and the lower exuding preventing layer are adhered without interposing an adhesive layer. I have. If the rubber layer is bonded to the exudation prevention layer without the interposition of the adhesive layer, uneven pressure and uneven thermal conductivity due to the adhesive layer do not occur. In particular, if a fluororesin film is used for the exudation prevention layer, not only can the compounding agent in the rubber be effectively prevented from exuding, but also because the elastic modulus is close to the rubber elastic modulus, the rubber elasticity of the rubber layer is reduced by the cushioning material. It can also be used effectively on surfaces. In this way, pressure unevenness due to unevenness of the surface of the hot platen or the mirror plate can be absorbed by the rubber layer, and the thermal expansion or contraction of the hot platen or the mirror plate can be followed. In this way, a uniform pressure distribution and a uniform thermal conductivity are obtained.

Preferably, the upper and lower rubber layers 10
% Thermal decomposition temperature is 380 ° C or higher. Rubber having heat resistance can be used as the material of the rubber layer. In particular,
Fluorine rubber, EPM, EPDM, hydrogenated nitrile rubber,
Silicone rubber, acrylic rubber, butyl rubber and the like are preferred. These rubber materials can be used alone, or blended, or mixed with other organic or inorganic materials. The rubber layer mainly composed of a rubber material has a thickness of 10
It is preferable to use one in which the compounding agent and the compounding ratio are adjusted so that the% thermal decomposition temperature is 380 ° C or higher.

Preferably, the main component forming the upper and lower rubber layers is a fluorine rubber having excellent heat resistance.

Preferably, the upper and lower exudation prevention layers are formed of a fluororesin film. The characteristic required for the exudation prevention layer is that exudation of the compounding agent in the rubber can be effectively prevented. Moreover, a material having an elastic modulus close to that of rubber is preferable. In this way, the rubber elasticity of the rubber layer can be effectively used on the surface of the cushioning material, so that uneven pressure due to unevenness of the surface of the heating plate or the mirror plate can be absorbed by the rubber layer. It can follow expansion and contraction. In this way, a uniform pressure distribution and a uniform thermal conductivity are obtained.

From the above viewpoint, the exudation preventing layer is preferably formed of a fluororesin film. Among the fluororesin films, tetrafluoroethylene-perfluoroalkylvinyl ether copolymer (PFA) and tetrafluoroethylene-hexafluoropropylene copolymer (FEP) are particularly preferred. When a fluororesin film is used as the exudation prevention layer, its thickness is 10 μm.
It is effective if it is in the range of m to 200 μm. A particularly preferred thickness range is 50 μm to 100 μm.

[0046]

【Example】

(Example 1) The cushioning material for forming press shown in FIG.
Two fiber material layers 31 and 32 positioned above and below via a binder material layer 30, an upper rubber layer 33 positioned on the upper surface of one fiber material layer 31, and a lower portion positioned on the lower surface of the other fiber material layer 32 A rubber layer 34, an upper exudation prevention layer 35 located on the upper surface of the upper rubber layer 33 to prevent exudation of the compounding agent contained in the upper rubber layer 33, and a lower A lower exudation prevention layer for preventing exudation of the compounding agent contained in the rubber layer;

As the fiber material layers 31 and 32, a non-woven fabric,
Woven fabric or paper is used. Two fiber material layers 31, 3
2 may be composed of the same kind of material or may be composed of different materials.

As the upper and lower rubber layers 33 and 34, any rubber having heat resistance may be used. For example, fluorine rubber, EPM, EPDM, hydrogenated nitrile rubber, silicone rubber, acrylic rubber, butyl rubber, etc. may be used. . Preferably, a fluorine rubber containing an acrylic monomer is used. As the acrylic monomer, tetrahydrofurfuryl methacrylate, methoxydiethylene glycol methacrylate, phenoxyethyl acrylate, phenoxydiethylene glycol acrylate, ethylene dimethacrylate, 1,3-butylene methacrylate, 1,4-butylene methacrylate, 1,6-
Hexanediol dimethacrylate, polyethylene glycol dimethacrylate, 1,4-butanediol diacrylate, 1,6-hexanediol diacrylate, 2,2'-bis (4-methacryloxydiethoxyphenyl) propane, 2,2'- Bis (4-acryloxydiethoxyphenyl) propane, trimethylolpropane triacrylate, trimethylolpropane trimethacrylate, and pentaerythritol triacrylate are exemplified.

By blending the acrylic monomer in the rubber, it is possible to directly bond the rubber layer and the exudation preventing layer without using an adhesive layer.

As the exudation prevention layers 35 and 36, a fluororesin film is most desirable in terms of flexibility, heat resistance and release properties. However, other materials can of course be used. As described above, the exudation prevention layer 3
5 and 36 are rubber layers 3 without an adhesive.
Since it is directly adhered to 3, 34, the problem of uneven pressure and temperature caused by the adhesive layer can be avoided.

(Example 2) A cushioning material for a forming press shown in FIG. 2 has a nonwoven fabric layer 40 containing a binder layer 41 therein.
And an upper rubber layer 42 located on the upper surface of the nonwoven fabric layer 40;
A lower rubber layer 43 located on the lower surface of the nonwoven fabric layer 40 and an upper exudation prevention layer 44 located on the upper surface of the upper rubber layer 42
And a lower exudation prevention layer 45 located on the lower surface of the lower rubber layer 43.

The nonwoven fabric layer 40 is made of an aromatic polyamide fiber. The binder 41 is a base fabric made of an aromatic polyamide fiber. The nonwoven fabric layer 40 and the base cloth 41 are needle-punched, and fibers enter the mesh of the base cloth. In this way, the entanglement of the fibers and the base fabric suppresses the spread of the nonwoven fabric layer 40 in the plane direction, and as a result, the dimension in the thickness direction is also stabilized.

The material of the upper and lower rubber layers 42 and 43 is a fluorine rubber containing an acrylic monomer.
The exudation prevention layers 44 and 45 are fluororesin films.

Example 3 A non-woven fabric layer 50 containing a first binder material layer 51 inside and a non-woven fabric layer 52 also containing a first binder material layer 53 inside a cushioning material for forming press shown in FIG. Are laminated with a second binder layer 54 interposed therebetween. An upper rubber layer 5 is formed on the upper surface of one nonwoven fabric layer 50.
5 and an upper exudation prevention layer 57 on the upper surface thereof.
Is located. The lower rubber layer 5 is formed on the lower surface of the other nonwoven fabric layer 52.
6 and a lower exudation prevention layer 58 on its lower surface.
Is located.

FIG. 4 schematically shows the structure of the first binder layer 51. The other first binder layer 53 has the same structure. As shown in the figure, the first binder layer 51 has a structure in which a fluororubber-based adhesive 51b is applied to a coarse glass cloth 51a with the eyes open.

The first binder layer 51 and the nonwoven fabric layer 50 are needle-punched, and similarly, the other first binder layer 5
3 and the nonwoven fabric layer 52 are needle-punched. FIG.
As shown in (1), since the first binder layer 51 has a mesh 51c, the fibers enter the mesh 51c. Thus, the nonwoven fabric layer 5
The spread of 0 and 52 in the plane direction is suppressed, and as a result, the dimension in the thickness direction is also stabilized.

As the nonwoven fabric layers 50 and 52, aromatic polyamide fibers are used. The basis weight of the nonwoven fabric layer 50 needle-punched including the first binder material layer 51 and the basis weight of the nonwoven fabric layer 52 needle-punched including the first binder material layer 53 are both 650 g / m ² . .

The second binder layer 54 is formed by applying a fluororubber adhesive to both surfaces of a glass cloth.

The material of the upper and lower rubber layers 55 and 56 is a fluorine rubber containing an acrylic monomer.
The material of the upper and lower exudation prevention layers 57 and 58 is a fluororesin film.

The advantages of the third embodiment as compared with the second embodiment are as follows. First, the first binder layer and the nonwoven fabric layer
Since the fibers are tied together by bonding in addition to the entanglement of the fibers, the bonding strength is stronger than the mere needle punch alone. Therefore, the dimensional stability of the bonded nonwoven fabric layers (50 and 51 and 52 and 53) is improved.

Further, since the two bonded non-woven fabric layers are laminated with the second bonding material layer 54 interposed therebetween, the weight unevenness of each bonded non-woven fabric layer can be offset, and the weight accuracy can be improved.

Further, since a fluororubber-based adhesive is used, it is excellent in heat resistance. In addition, since it has excellent flexibility, the cushioning property of the fiber material layer is not impaired.

Example 4 The cushioning material for forming press shown in FIG. 5 has three bonded nonwoven fabric layers 60, 61, 62. Each of the bonded non-woven fabric layers 60, 61, 62 includes a non-woven fabric layer 6 including a first bonding material layer 60b, 61b, 62b therein.
0a, 61a and 62a, which have been subjected to a needle punching process. The basis weight of each bonded nonwoven fabric layer 60, 61, 62 is 450 g / m ² .

Each bonded nonwoven fabric layer 60, 61, 62
They are connected via bonding material layers 63 and 64. An upper rubber layer 65 is located on the upper surface of the uppermost bonded nonwoven fabric layer 60, and an upper exudation prevention layer 67 is located on the upper surface. The lower rubber layer 66 is located on the lower surface of the lowermost bonded nonwoven fabric layer 62, and the lower exudation preventing layer 6
8 is located.

The structure of the first binder layers 60b, 61b, 62b is the same as that shown in FIG. Non-woven fabric layer 60
a, 61a and 62a are aromatic polyamide fibers.
The second binder layers 63 and 64 are formed by applying a fluororubber adhesive to both surfaces of a glass cloth.

The material of the rubber layers 65 and 66 is a fluoro rubber containing an acrylic monomer. Exudation prevention layer 6
7, 68 are made of a fluororesin film.

The structure of the fourth embodiment differs from that of the third embodiment in that firstly, three bonded nonwoven fabric layers are laminated, and secondly, the basis weight of the bonded nonwoven fabric layer is small. Since the bonded nonwoven fabric layers having a small basis weight are laminated in more layers, the overall basis weight accuracy is further improved. However, regarding the cushioning property, the structure of the second embodiment is better.

Example 5 The cushioning material for forming press shown in FIG. 6 has three paper layers 70, 71 and 72. This paper layer is made of a mixed papermaking of aromatic polyamide fibers and rock wool.

Each of the paper layers 70, 71, 72 is composed of the binder layer 7.
3, 74. Binder layers 73, 74
Is obtained by applying a fluororubber adhesive to both surfaces of a glass cloth.

The upper rubber layer 75 is located on the upper surface of the uppermost paper layer 70, and the upper exudation prevention layer 7
7 is located. The lower rubber layer 76 is located on the lower surface of the lowermost paper layer 72, and the lower exudation prevention layer 78 is located on the lower surface.

The upper and lower rubber layers 75 and 76 are made of a fluorine rubber containing an acrylic monomer. The exudation prevention layers 77 and 78 are fluororesin films.

The features of the fifth embodiment are as follows. The weight accuracy and thickness accuracy of the paper layer itself are better than that of the nonwoven fabric. Therefore, the weight per unit area is improved.
Further, since the rubber layer is laminated on the surface, the cushioning property is better than that of a conventional mixed papermaking type cushion material. Also, there are no surface irregularities. However, Examples 2, 3,
4 and Examples 6 and 7 described below are inferior in cushioning properties.

(Example 6) The cushioning material for forming press shown in FIG. 7 has a woven fabric layer 80 at the center and binder layers 81 and 82 on the upper and lower surfaces thereof. One binder layer 8
A bonded nonwoven fabric layer 83 is located on the upper surface of the first nonwoven fabric. The bonded nonwoven fabric layer 83 includes a nonwoven fabric layer 83a needle-punched together with an inner bonding material layer 83b. The other binder layer 8
On the lower surface of 2, a bonded nonwoven layer 84 is located. This bonded nonwoven layer 84 also includes a nonwoven layer 84a that has been needle punched together with an internal bonding material layer 84b.

The upper rubber layer 85 is located on the upper surface of the bonded nonwoven fabric layer 83 located above, and the upper exudation prevention layer 87 is located on the upper surface. The lower rubber layer 86 is located on the lower surface of the bonded non-woven fabric layer 84 located below, and the lower exudation prevention layer 88 is located on the lower surface.

The woven fabric layer 80 is composed of a multi-woven cloth of aromatic polyamide fibers. The binder layers 81 and 82 are formed by applying a fluororubber-based adhesive to both surfaces of a glass cloth. The bonded nonwoven fabric layers 83 and 84 have the same structure as the bonded nonwoven fabric layer of Example 4.

The rubber layers 85 and 86 are made of fluororubber containing an acrylic monomer, and
8 is a fluororesin film.

The feature of Example 6 is that the woven fabric layer 80 compensates for the uneven weight and poor dimensional stability, which are disadvantages of the nonwoven fabric, and that the advantage of the cushioning property, which is an advantage of the nonwoven fabric, is utilized. is there.

(Embodiment 7) In the cushioning material for forming press shown in FIG. 8, two bonded nonwoven fabric layers 91 and 92 are laminated via a second bonding material layer 90. One bonded nonwoven fabric layer 9
The upper rubber layer 93 is located on the upper surface of the first and the upper exudation prevention layer 95 is located on the upper rubber layer 93. The lower rubber layer 94 is located on the lower surface of the lower bonded nonwoven fabric layer 92, and the lower exudation prevention layer 96 is located on the lower surface. The upper bonded nonwoven fabric layer 91 includes a nonwoven fabric layer 91a needle-punched together with an inner binder material layer 91b. The lower bonding nonwoven fabric layer 92 also has an inner bonding material layer 92b.
And a non-woven fabric layer 92a needle-punched.

The structure of the seventh embodiment shown in FIG. 8 is the same as that of the third embodiment shown in FIG. 3, except that the second binder layer 90 is made of a fluoro rubber sheet.

A feature of the seventh embodiment is that the effect of absorbing uneven pressure caused by uneven weight and uneven surface of the nonwoven fabric layer is large.

(Comparison of characteristics) The characteristics of the conventional molding press cushion material and the molding press cushion material according to the present invention were compared. The structure of the compared cushioning material is as follows.

Comparative Example 1 15 kraft papers were stacked.

[Comparative Example 2] This has the structure shown in FIG. Silicone rubber was used as the rubber sheet 8, and a plain woven cloth of aromatic polyamide fiber was used as the reinforcing woven fabric 9.

[Comparative Example 3] This has the structure shown in FIG. An aromatic polyamide fiber was used as the needle-punched nonwoven fabric 10, and an aromatic polyamide fiber base cloth was used as the reinforcing base cloth 11.

[Comparative Example 4] This has the structure shown in FIG. An aromatic polyamide fiber was used as the needle-punched nonwoven fabric 14, an aromatic polyamide fiber base fabric was used as the reinforcing base fabric, EPDM was used as the rubber layer 13, and a simulated glass cloth was used as the reinforcing woven fabric 12. .

[Comparative Example 5] This has the structure shown in FIG. An aromatic polyamide fiber was used as the needle-punched nonwoven fabric 16, an aromatic polyamide fiber base cloth was used as the reinforcing base cloth, and an adhesive material in which a glass cloth was impregnated with an epoxy resin was used as the adhesive layer 18.

Comparative Example 6 This has the structure shown in FIG. As the mixed papermaking 19, a mixed paper made of an aromatic polyamide fiber and rock wool was used.

[Comparative Example 7] This has the structure shown in FIG. Silicone rubber was used for the rubber layer 21, and aromatic polyamide fiber was used for the needle punched nonwoven fabric 20.

[Embodiment 2] This embodiment has the structure shown in FIG.

[Embodiment 3] This embodiment has the structure shown in FIG.

[Embodiment 4] It has the structure shown in FIG.

[Embodiment 5] This embodiment has the structure shown in FIG.

[Embodiment 6] This embodiment has the structure shown in FIG.

[Embodiment 7] This embodiment has the structure shown in FIG.

The characteristics of Comparative Examples 1 to 7 and Examples 2 to 7 were compared, and the results are shown in Table 1.

[0096]

[Table 1]

[Brief description of the drawings]

FIG. 1 is a sectional view showing an embodiment of the present invention.

FIG. 2 is a sectional view showing another embodiment of the present invention.

FIG. 3 is a sectional view showing still another embodiment of the present invention.

FIG. 4 is a view schematically showing a structure of a first binder layer 51 shown in FIG. 3;

FIG. 5 is a sectional view showing still another embodiment of the present invention.

FIG. 6 is a sectional view showing still another embodiment of the present invention.

FIG. 7 is a sectional view showing still another embodiment of the present invention.

FIG. 8 is a sectional view showing still another embodiment of the present invention.

FIG. 9 is a cross-sectional view in which components for forming and pressing an object to be processed are stacked and arranged.

FIG. 10 is a cross-sectional view showing an example of a conventional cushioning material for forming press.

FIG. 11 is a cross-sectional view showing another example of a conventional cushioning material for forming press.

FIG. 12 is a cross-sectional view showing still another example of a conventional cushioning material for forming press.

FIG. 13 is a cross-sectional view showing still another example of the conventional cushioning material for forming press.

FIG. 14 is a cross-sectional view showing still another example of a conventional cushioning material for forming press.

FIG. 15 is a sectional view showing still another example of the conventional cushioning material for forming press.

16 is a partially enlarged sectional view of FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 30 Binder layer 31, 32 Fiber material layer 33 Upper rubber layer 34 Lower rubber layer 35 Upper exudation prevention layer 36 Lower exudation prevention layer

Claims (21)

(57) [Claims] 1. A fiber material layer comprising two or more fiber material layers, a bonding material layer located between the fiber material layers and joining upper and lower fiber material layers, and a top surface of the uppermost fiber material layer An upper rubber layer, a lower rubber layer located on the lower surface of the lowermost fiber material layer, and an upper exudate located on the upper surface of the upper rubber layer to prevent exudation of the compounding agent contained in the upper rubber layer A cushioning material for a molding press, comprising: a prevention layer; and a lower exudation prevention layer located on a lower surface of the lower rubber layer and preventing exudation of a compounding agent contained in the lower rubber layer. 2. The molding press cushion material according to claim 1, wherein the fibrous material layer is a nonwoven fabric, a woven fabric, or paper. 3. The cushioning material for forming press according to claim 2, wherein all the fiber material layers are made of the same material. 4. The molding press cushion material according to claim 2, wherein one or more fiber material layers and another fiber material layer are made of different materials. 5. The cushioning material for forming press according to claim 1, wherein the binder layer has an adhesive. 6. The bonding material layer has a sheet-like base material having a small amount of deformation in a plane direction with respect to heat and pressure, and an adhesive applied to both surfaces of the base material. The cushioning material for forming press according to any one of claims 1 to 4. 7. The cushioning material according to claim 1, wherein the binder layer is a rubber sheet. 8. The cushioning material for forming press according to claim 7, wherein the binder layer is a rubber sheet in which a reinforcing base cloth is embedded. 9. The fibrous material layer is a non-woven fabric, the binder layer is a base fabric, and the non-woven fabric and the base fabric are bonded by entanglement of a fiber formed by a needle punch and the base fabric,
The molding press cushion material according to claim 1. 10. An adhesive is applied to a base cloth, and the nonwoven fabric and the base cloth are bonded by entanglement of fibers formed by needle punching with the base cloth and adhesion by an adhesive. Item 10. A cushioning material for molding press according to item 9. 11. The binder layer includes a first binder layer and a second binder layer, the fibrous material layer is a nonwoven fabric, the first binder material layer is a base fabric, and the nonwoven fabric and the base fabric are Are bonded by the entanglement of the fiber formed by the needle punch and the base cloth, the second binder layer has an adhesive, and the laminated portion of the fiber material layer and the binder layer has two or more layers. The bonded nonwoven fabric layer obtained by bonding the nonwoven fabric layers of the above with the first bonding material layer is formed by laminating in multiple stages via the second bonding material layer.
2. The cushioning material for forming press according to item 1. 12. The second bonding material layer has a sheet-like base material having a small amount of deformation in the surface direction with respect to heat and pressure, and an adhesive applied to both surfaces of the base material. Item 12. A cushioning material for molding press according to item 11. 13. An adhesive is applied to a base fabric of the first binder layer, and the nonwoven fabric and the base fabric are entangled with fibers formed by needle punch and the base fabric, and are bonded by the adhesive. The cushioning material for a molding press according to claim 11, wherein the cushioning material is bonded by the following. 14. The molding press cushion material according to claim 5, wherein the adhesive is a fluororubber-based adhesive. 15. The fibrous material layer has a glass transition temperature of 20.
The cushioning material for a molding press according to any one of claims 1 to 14, wherein the cushioning material comprises fibers having a temperature of 0 ° C or higher and a 10% thermal decomposition temperature of 400 ° C or higher. 16. The molding press cushion material according to claim 1, wherein an acrylic monomer is blended in the composition for forming the upper and lower rubber layers. 17. The cushioning material for a molding press according to claim 1, wherein the upper rubber layer and the upper exudation preventing layer, and the lower rubber layer and the lower exuding preventing layer are adhered without interposing an adhesive layer. . 18. The cushioning material for a molding press according to claim 1, wherein the upper and lower rubber layers have a 10% thermal decomposition temperature of 380 ° C. or higher. 19. The molding press cushion material according to claim 1, wherein a main component forming the upper and lower rubber layers is a fluorine rubber. 20. The cushioning material for a molding press according to claim 1, wherein a main component forming the upper and lower rubber layers is EPDM. 21. The cushioning material for a molding press according to claim 1, wherein the exudation preventing layer is a fluororesin film.